linux-stable.git/include/linux/rcupdate.h, branch linux-2.6.24.y

Immunize rcu_dereference() against crazy compiler writers

2007-10-17T15:42:46+00:00

Turns out that compiler writers are a bit more aggressive about optimizing
than one might expect.  This patch prevents a number of such optimizations
from messing up rcu_deference().  This is not merely a theoretical problem, as
evidenced by the rmb() in mce_log().

Signed-off-by: Paul E. McKenney 
Cc: Ingo Molnar 
Acked-by: Josh Triplett 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

lockdep: annotate rcu_read_{,un}lock{,_bh}

2007-10-11T20:11:12+00:00

lockdep annotate rcu_read_{,un}lock{,_bh} in order to catch imbalanced
usage.

Signed-off-by: Peter Zijlstra 
Signed-off-by: Ingo Molnar 
Cc: Paul E. McKenney

RCU: Remove prototype for nonexistent function synchronize_idle()

2007-08-11T22:47:41+00:00

synchronize_idle() sounds like an interesting function, but we don't
actually have it, so don't prototype it.  Introduced in commit
9b06e818985d139fd9e82c28297f7744e1b484e1, in 2005.

Signed-off-by: Josh Triplett 
Acked-by: Paul E. McKenney 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] RCU: CREDITS and MAINTAINERS

2006-10-04T14:55:31+00:00

Add MAINTAINERS entry for Read-Copy Update (RCU), listing Dipankar Sarma as
maintainer, and giving the URL for Paul McKenney's RCU site.  Add
MAINTAINERS entry for rcutorture, listing myself as maintainer.  Add
CREDITS entries for developers of RCU, RCU variants, and rcutorture.  Use
Paul McKenney's preferred email address in include/linux/rcupdate.h .

Signed-off-by: Josh Triplett 
Cc: Paul McKenney 
Cc: Dipankar Sarma 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] rcu: simplify/improve batch tuning

2006-10-04T14:55:31+00:00

Kill a hard-to-calculate 'rsinterval' boot parameter and per-cpu
rcu_data.last_rs_qlen.  Instead, it adds adds a flag rcu_ctrlblk.signaled,
which records the fact that one of CPUs has sent a resched IPI since the
last rcu_start_batch().

Roughly speaking, we need two rcu_start_batch()s in order to move callbacks
from ->nxtlist to ->donelist.  This means that when ->qlen exceeds qhimark
and continues to grow, we should send a resched IPI, and then do it again
after we gone through a quiescent state.

On the other hand, if it was already sent, we don't need to do it again
when another CPU detects overflow of the queue.

Signed-off-by: Oleg Nesterov 
Acked-by: Paul E. McKenney 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] rcu: Add lock annotations to RCU locking primitives

2006-06-30T18:25:39+00:00

Add __acquire annotations to rcu_read_lock and rcu_read_lock_bh, and add
__release annotations to rcu_read_unlock and rcu_read_unlock_bh.  This
allows sparse to detect improperly paired calls to these functions.

Signed-off-by: Josh Triplett 
Acked-by: Paul E. McKenney 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] rcutorture: add call_rcu_bh() operations

2006-06-28T00:32:40+00:00

Add operations for the call_rcu_bh() variant of RCU.  Also add an
rcu_batches_completed_bh() function, which is needed by rcutorture.

Signed-off-by: Paul E. McKenney 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Make RCU API inaccessible to non-GPL Linux kernel modules

2006-06-23T14:43:07+00:00

Remove synchronize_kernel() (deprecated 2-APR-2005 in
http://lkml.org/lkml/2005/4/3/11) and makes the RCU API inaccessible to
non-GPL Linux kernel modules (as was announced more than one year ago in
http://lkml.org/lkml/2005/4/3/8).  Tested on x86 and ppc64.

Signed-off-by: "Paul E. McKenney" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] RCU: introduce rcu_needs_cpu() interface

2006-05-15T18:20:55+00:00

With "Paul E. McKenney" 

Introduce rcu_needs_cpu() interface.  This can be used to tell if there
will be a new rcu batch on a cpu soon by looking at the curlist pointer.
This can be used to avoid to enter a tickless idle state where the cpu
would miss that a new batch is ready when rcu_start_batch would be called
on a different cpu.

Signed-off-by: Heiko Carstens 
Cc: "Paul E. McKenney" 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] kernel/rcupdate.c: make two structs static

2006-03-23T15:38:17+00:00

This patch makes two needlessly global structs static.

Signed-off-by: Adrian Bunk 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds